linux-kernel - Re: [PATCH 4/8] perf daemon: Add daemon command

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Date:   Tue, 15 Dec 2020 20:20:16 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>, lkml <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Michael Petlan <mpetlan@...hat.com>,
        Ian Rogers <irogers@...gle.com>,
        Stephane Eranian <eranian@...gle.com>,
        Alexei Budankov <abudankov@...wei.com>
Subject: Re: [PATCH 4/8] perf daemon: Add daemon command

On Tue, Dec 15, 2020 at 12:44:08PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Sat, Dec 12, 2020 at 11:43:54AM +0100, Jiri Olsa escreveu:
> > Adding daemon command that allows to run record sessions
> > on background. Each session represents one perf record
> > process and is configured in config file.
> > 
> > Example:
> > 
> >   # cat config.daemon
> >   [daemon]
> >   base=/opt/perfdata
> > 
> >   [session-1]
> >   run = -m 10M -e cycles -o /opt/perfdata/1/perf.data --overwrite --switch-output -a
> > 
> >   [session-2]
> >   run = -m 20M -e sched:* -o /opt/perfdata/2/perf.data --overwrite --switch-output -a
> > 
> > Default perf config has the same daemon base:
> > 
> >   # cat ~/.perfconfig
> >   [daemon]
> >   base=/opt/perfdata
> > 
> > Starting the daemon:
> > 
> >   # perf daemon --config config.daemon
> > 
> > Check sessions:
> 
> "Check"? You mean that using 'perf daemon' without any args will just
> attach to whatever daemon is running and list the current sessions?
> 
> So we can only have one daemon running in a machine?
> 
> That seems constraining, perhaps we can give each daemon a name?

as I explained in the other email, the difference is the base path
specified for both daemon and other commands

I made other changes showing line for daemon process itself
with base path:

  $ sudo /opt/perf/bin/perf daemon
  [690174:daemon] base: /opt/perfdata
  [690175:top] perf record -e cycles --switch-output=1m --switch-max-files=6 -a

  $ sudo /opt/perf/bin/perf daemon -v
  [690174:daemon] base: /opt/perfdata
    output:  /opt/perfdata/output
    lock:    /opt/perfdata/lock
    up:      268 minutes
  [690175:top] perf record -e cycles --switch-output=1m --switch-max-files=6 -a
    base:    /opt/perfdata/top
    output:  /opt/perfdata/top/output
    control: /opt/perfdata/top/control
    ack:     /opt/perfdata/top/ack
    up:      268 minutes

jirka